vue中使用openlayers,给定一组归一化坐标数据,怎么在地图画布上使用这组坐标绘制图形
时间: 2024-05-22 21:12:32 浏览: 201
1. 在Vue中安装OpenLayers库
```
npm install ol
```
2. 在Vue组件中引入OpenLayers库和样式文件
```
import 'ol/ol.css';
import { Map, View } from 'ol';
import { Tile as TileLayer, Vector as VectorLayer } from 'ol/layer';
import { OSM, Vector as VectorSource } from 'ol/source';
import { Circle as CircleStyle, Fill, Stroke, Style } from 'ol/style';
```
3. 创建一个地图容器
```
<template>
<div id="map" style="height: 400px; width: 100%;"></div>
</template>
```
4. 在Vue组件中创建地图对象和图层
```
<script>
export default {
name: 'MapComponent',
mounted() {
// 创建地图容器
const map = new Map({
target: 'map',
layers: [
new TileLayer({
source: new OSM()
})
],
view: new View({
center: [0, 0],
zoom: 2
})
});
// 创建矢量图层
const vectorLayer = new VectorLayer({
source: new VectorSource(),
style: new Style({
image: new CircleStyle({
radius: 5,
fill: new Fill({ color: 'red' }),
stroke: new Stroke({ color: 'white', width: 1 })
})
})
});
// 添加矢量图层到地图
map.addLayer(vectorLayer);
// 给定一组归一化坐标数据
const coordinates = [
[0.5, 0.5],
[0.6, 0.6],
[0.7, 0.4],
[0.3, 0.8],
[0.9, 0.2]
];
// 将归一化坐标转换为地理坐标
const features = coordinates.map(coord => {
return new Feature({
geometry: new Point(fromExtent([coord[0], coord[1], coord[0], coord[1]]))
});
});
// 添加要素到矢量图层
vectorLayer.getSource().addFeatures(features);
}
}
</script>
```
5. 在地图画布上绘制图形
使用`fromExtent`方法将归一化坐标转换为地理坐标,然后创建一个`Point`要素,并添加到矢量图层中。
在样式中使用`CircleStyle`来定义点的样式,并将其作为`Style`对象的`image`属性传递给矢量图层。
最终效果如下图所示:

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